SURGICAL INSTRUMENT FOR DRILLING

Abstract

The present disclosure is in the field of surgical instrument, in particular drills used by surgeons and or dentist, or surgical robots. It is known that a motor generates a torque during rotating accelerations and decelerations. Accelerations and sharp brakes from powerful motors also generate torques to be countered by the surgeon wrist, or the robot chassis. In order to solve this problem, there is proposed a surgical power motor. The motor is made of two rotating parts, rotating in opposed directions, and further includes an inverter to link one rotating part with the other rotating part, each rotating part producing the similar acceleration torque and at least one being powered either by an electric or pneumatic source.

Claims

1. Surgical power motor, wherein the motor is made of two rotating parts, rotating in opposed directions, and further comprising an inverter to link one rotating part with the other rotating part, each rotating part producing the similar acceleration torque and at least one being powered either by an electric or pneumatic source.

2. The surgical power motor of claim 1, wherein the first part and the second part are placed on a same or parallel axis.

3. The surgical power motor of claim 2, wherein the first part is a motor and the second part is a passive rotating element.

4. The surgical power motor of claim 2, wherein the first part is a first motor and the second part is a second motor.

5. The surgical power motor of claim 1, wherein the first part and the second part have the same size and mass.

6. The surgical power motor of claim 1, wherein the first part and the second part have a different size and mass.

7. The surgical power motor of claim 1, wherein the first part and second part are mounted side-by-side.

8. The surgical power motor of claim 1, wherein the first part and second part are mounted one behind the other one.

9. The surgical power motor of claim 1, wherein the first part is the motor and second part arranged around the first part.

10. The surgical power motor of claim 1, comprising an attachable drill bit.

11. The surgical power motor of claim 4, in which the first part is a first motor and the second part is a second motor, each motor being independently driven based on drilling conditions.

12. The surgical power motor of claim 1, further comprising a mountable—and removable—thermally-insulating jacket.

13. The surgical power motor of claim 2, wherein the first part and the second part have the same size and mass.

14. The surgical power motor of claim 3, wherein the first part and the second part have the same size and mass.

15. The surgical power motor of claim 4, wherein the first part and the second part have the same size and mass.

16. The surgical power motor of claim 2, wherein the first part and the second part have a different size and mass.

17. The surgical power motor of claim 3, wherein the first part and the second part have a different size and mass.

18. The surgical power motor of claim 4, wherein the first part and the second part have a different size and mass.

19. The surgical power motor of claim 2, wherein the first part and second part are mounted side-by-side.

20. The surgical power motor of claim 11, wherein the drilling conditions are selected from the group consisting of heat generated, vibrations detected, torques or torque variations detected, and speed fluctuations detected.

Description

BRIEF DESCRIPTION OF THE FIGURES

[0012] The present invention will be better understood thanks to the attached figure in which

[0013] FIG. 1 illustrates a drill according to the prior art

[0014] FIG. 2 illustrates a drill according to embodiment with 2 adjacent motors

[0015] FIG. 3 illustrates the embodiment where the two rotative members are placed in front of each other.

[0016] FIG. 4 illustrates another embodiment with a passive rotating element,

[0017] FIG. 5 illustrates another embodiment with a rotating mass.

[0018] FIG. 6 illustrates an execution with non-parallel rotating parts

[0019] FIG. 7 illustrates a drill receiving a thermally-Insulating removable jacket

DETAILED DESCRIPTION

[0020] The FIG. 1 illustrates a motor for surgical application which have one element producing the drilling torque. As explained above, each rotation speed variation of the motor produces a torque that the holder of the motor (hand or robot) should compensate.

[0021] According to the present invention, the motor of the drill comprises a first and a second part, each part rotating in a different direction. As a consequence, the inertia torque generated by one part cancels the inertia torque generated by the other one. The rotative parts being powered by either an electrical source or a pneumatic source.

[0022] The first and the second part form the motor assembly in charge of delivering a drilling torque for a surgical tool.

[0023] In a first embodiment, both parts participate to the drilling torque, the first part being connected with an inverter with the second part in order to produce the torque in the opposite rotating direction as the second part.

[0024] According to one embodiment, the two parts are identical in rotation speed, mass and size so that the acceleration torque of one part counter-balance the acceleration torque of the second part.

[0025] According to another embodiment, the two parts might have their specific rotation speed, mass and size as long as the acceleration torque produced by each part is of the same order of magnitude.

[0026] In a further embodiment, only one part is an active motor (the main part) and generates the drilling torque, the other part being a passive rotating element, playing only the role of acceleration torque cancellation, without providing additional power. Due to the presence of the inverter, the passive rotating element generates, while rotating, the same acceleration torque but in opposite direction. In this embodiment, the size, mass of the second part can be the same or different than the main part as long as the acceleration torque is the same as the acceleration torque of the main part.

[0027] Various arrangements of the first part and the second part can be realized. According to one version illustrated by the FIG. 2, both parts are mounted in parallel, side by side and connected by the inverter. In this example, the part PA and PB are two motors contributing to the generation of the drilling torque. The end of the axis of the second part PB is terminated by a gear engaged with another gear mounted on the axis of the first part PA. Both parts are rotating in opposite directions. The end of the first part PA is connected to the drill holding mechanism.

[0028] In the example of the FIG. 3, the part PA and part PB are positioned one behind the other one. The axis of each part can be the same or, as it is illustrated, slightly different.

[0029] In the example of the FIG. 4, only the part PA contributes to the drilling force. This part is the motor. The part PB is in the shape of a ring having a different size and mass than the part PA. The part PB is designed to create the similar acceleration torque as the part PA. The inverter linking the part PA and part PB can be a simple rotation inverter with a speed ration 1:1 or a inverter having a different ratio. The ratio will be taken into account to determine the mass, size and position of the part PB in order to produce the similar acceleration torque.

[0030] In the example of the FIG. 5, we have another design with the part PB having a different axis as the part PA. The part PB is realized by an element in which the volume and mass is calculated to produce the same acceleration torque as the part PA.

[0031] The FIG. 6 illustrates an example in which the axes of both parts are not parallel. With the axis in bold, we show the resulting axis of the combination of the acceleration torque. This axis is also preferably the axis of the drill output DOUT. The principle stays the same, one part PA generates an acceleration torque that is offset of the acceleration torque of the second part PB.

[0032] The FIG. 7 illustrates one embodiment with the rotating elements mounted side-by-side and in which a thermally insulated jacket is inserted. This jacket can be removed for washing for example. The first and the second part form the motor assembly. The removable jacket can be mounted, by sliding, around the motor assembly.